Computing system



July 22, 1941.

H. G. JOHNSTONE ET AL COMPUTING SYSTEM Filed Aug. 28, 1928 8 Sheets-Sheet 1 July 22, 1941.

H. G. JOHNSTONE ETAL COMPUTING SYSTEM Filed Aug. 2a, 1923 8 Sheets-Sheet 2 y 22, 1941- H. s. JOHNSTONE m m. 2,250,103

COMPUTING SYSTEM 8 Sheets-Sheet 3 Filed Aug. 28, 1928 July 22, 1941.

H. G. JOHNSTONE EI'AL COMPUTING SYSTEM Filed Aug. 2a, 1928 8 Sheets-Sheet 7 Hamh J0/7/75/0/76 Char/es #Z flabb/ns l/ y 1941. H. G. JOHNSTONE ETAL 2,250,108

commune SYSTEM 8 Sheets-Sheet 8 Filed Aug. 28, 1928 Patented July 22, 1941 UNITED STATES PATENT OFFICE COMPUTING SYSTEM Application August 28, 1928, Serial No. 302,462

81 Claims.

This invention relates to computing systems, and more particularly to an electrically operated, mathematical multiplication system which is adapted to automatically indicate and record products.

In conducting the business of a manufacturing organization, it is the practice in some instances to record data pertaining to each job in a particular shop or department and at a later date transcribe the data and compute the costs incident to the manufacture of a given article. It is necessary in computing the cost of an article of manufacture to consider several factors, such as for example, the hourly rate of the operator, the loading rates or costs of operating different machines, the labor loading, the number of hours expended in the production of the particular ar ticle, etc. The compilation of these factors requires the performance of several mathematical computations. Manifestly, to perform all of the necessary multiplications even with the aid of manually operated computing devices and to manually record and convey the results to other remotely positioned stations requires considerable time and effort. The efiiciency of a system for obtaining the products of the desired factors and their ultimate recording is, of course, dependent on the manual effort expended and the time required.

The principal object of the present invention is to provide an efficiently operable and flexible system for accomplishing mathematical computations and recording the results with a minimum expenditure of effort and time.

In accordance with one embodiment, the invention contemplates a system using an electrical multiplying system in which there are nine sets of nine each of electrical contact disks, each contact disk representing the product of one digit by another digit and provided with an associated contact brush so that the position of a contact on one-half of the circumference represents the unit number of the particular product and a contact on the other half the tens part. The multiplicaiid and multiplier are set up on keys which close certain electrical circuits; whereby beginning with units, power is fed, for each digit in the multiplier, one at a time, through the contacts on the disks through distributing brushes to an accumulating, indicating, registering or recording device, such as an electrical card punch having perforating selectors, which device can be located at a station remote from the keys.

The distributing brushes transfer the electrical connections from units to tens, tens to hundreds,

hundreds to ten hundreds, etc., at theproper point in each cycle. The entire product of a digit in the multiplier by the multiplicand is recorded on the accumulating device for one revolution of the contact disks. When the final product is set up in the accumulating device, the card punch electrically connected thereto is operated to actuate the perforating selectors to cause the perforation of a card corresponding to denominationaldigit positions, as controlled by the final product of a multiplication.

Other features and objects of the invention will be apparent from the following detailed description, reference being had to the accompanying drawings, wherein Figs. 1, 2 and 3 are circuit diagrams which, when viewed collectively with Fig. 2 to the right of Fig. 1 and Fig. 3 to the right of Fig. 2, disclose an electrical multiplying and recording system representing one embodiment of the invention;

Fig. 4 is a fragmentary front elevational view 'of the multiplying mechanism;

Fig. 5 is a vertical sectional view taken on line 5-5 of Fig. 4;

Fig. 6 is a fragmentary sectional view taken on line 6--6 of Fig. 4;

, Figs. 7 and 8 are sectional views taken on lines 1-! and 88, respectively, of Fig. 4 showing one of the disc-units on the multiplying commutator;

Fig. 9 is an enlarged fragmentary schematic of three of the sets of nine each of the contact discs representing the electrical multiplication system on the multiplying commutator;

Fig. 10 is a plan view of the multiplicand and multiplier key board;

Fig. 11 is a plan view of the perforating apparatus;

Fig. 12 is a rear elevation of the apparatus shown in Fig. 11;

Fig. 13 is a sectional view taken on the line I3--l3 of Fig. 12;

Fig. 14 is also a sectional view taken on the line l4-I4 of Fig. 12;

Fig. 15 is a sectional view taken on the line l5 l5 of Fig. 12 and shows a part of the clutch operating mechanism and the .drive through which power is communicated to the various parts of the apparatus;

Fig. 16 is a sectional View taken on the line l6-IB of Fig. 12 showing the arrangement of the gears through which power is communicated to sequence or contact switches;

Fig. 17 is a sectional view taken on the line H- 41 of Fig. 15,

Fig. 18 is a sectional view taken on the line l8--I8 of Fig. 13 and shows in section the arrangement of the selecting bars and their associated perforating members, and

Fig. 19 is a plan view of a record card in which the multiplicand, multiplier and the product thereof is expressed in the form of perforations.

Referring to the drawings in which similar parts are designated by the same numerals in the several views, it is believed that a clear understanding of the invention will be had therefrom when considered in conjunction with the following description. In examining the circuit diagram, Fig. 3 should be arranged immediately to the right of Fig. 2 and Fig. 2 to the right of Fig. 1. Referring now to Figs. 1 and 2, the multiplicand and multiplier key banks designated generally by the numerals I and IOI, respectively, are represented schematically by a coordinate group of lines, the vertical lines or columns from right to left denoting units (U), tens (T), hundreds (H), ten-hundreds (TH), and ten-thousands (TT), and the nine rows of cross lines designating the digits 1 to 9 consecutively. Each intersection of the lines represents an electrical contact, normally open, which can be closed by any suitable locking key I02 (Figs. 1 and such as described and disclosed in A. D. Hargan Patent No. 1,378,950, issued May 24, 1921.

Any particular problem of multiplication can be set up on the key banks I00.-IOI by closing the contacts at the points corresponding to the digits in the multiplicand and multiplier. These contact closures complete electrical circuits through a multiplying commutator'l05 and send electric currents to a distributor switch denoted generally as I06 which directs the currents to an accumulator I0'I for properly registering or accumulating the results.

The multiplying commutator I05 comprises an electrical multiplication table in which there are nine sets, designated as I03, of nine each of electrical contact disks insulated from each other and divided into twenty-seven units of three each, designated by the numeral I04, so adapted that each contact represents one of a series of numbers representing the product of each digit times itself and each other digit running from 01 to 81. Each of the nine sets I03 of nine contact disks represents the numbers 1 to 9 consecutively and are connected to individual conductors leading to the corresponding digit in the multiplicand key bank I00-. The contact disks are insulated from and secured to a rotating shaft I 08 journaled in bearings IDS-I09 fastened to a frame IIO (Fig. 4). The shaft I08 is rotated by means of a gear II5 fastened thereto meshing with a spur gear II6 of a speed reducer III which is driven by a belt II8 from a motor [[9 rigidly secured to the frame iI0. Each unit I04 of three contact disks is also provided with an associated feed disk I (Fig. 7) for making connections with the digit cross lines in the multiplicand key bank. The contact disks have individual brushes and are so constructed that the position of a contact on one-half of the circumference represents the unit number of the particular product of two digits and a contact on the other half the tens part.

Figs. 7 and 8 show one of the units I04 of three disks I25, I26 and I2! representing the products of multiplying 2 by 1, 9, and 2, respectively. These disk units I04 are similar in construction to sequence switches commonly used in telephone exchange systems. The three copper disks I25,

I26 and I2! are mounted on an insulator I28 and are electrically interconnected due to the fact that the disks I26 and I2! are integral and are connected with the disk I25 by means of copper rivets I29 passing through the insulator and serving to hold the elements together as the unit I04. The insulator I28 is keyed to the commutator shaft I08 and insulates the associated copper disks therefrom. Disk I25 has one radial contact I32 representing the product 02 of 2x1 to be engaged by a brush I33 at a predetermined point in the rotation of the unit I04; the disk I26 has two radial contacts I34 and I35 representing the tens digit 1, and the units digit 8 of the product 18 of 2x9 to be engaged by a brush I38; and disk I21 has a contact I31 representing the product 04 of 2 2 to be engaged by a brush I38. A feed brush I39 contacts continuously (a triangular headed arrow designates a brush which is always in contact) with a feed disk I40 which is shown in Fig. 7 as being integral with disk I25. The brushes, as shown in Figs. 1 and 9, are connected through conductors to the multiplicand and multiplier key banks. The above described unit was selected for purposes of illustration and it will be understood that the other units are of similar construction and are analogous to sequence switches used in telephone systems.

Fig. 9, the enlarged fragmentary schematic of the multiplying commutator, shows the arrangement of the multiplication table for three of the sets I03 representing the digits 1, 2 and 3. The multiplication table as illustrated follows the series of 1X1, 1X9, 1 2, 1X3, 1 4, 1X5, 1X6, 1 7, and 1X8; 2 1, 2x9, 2 2, 2 3, 2 4, 2 5, 2x6, 2x7, and 2X8; 3X 3X9, 3x2, etc., wherein each of the contacts represents a particular product. The multiplication table follows the usual order except that the digit 9 is placed between the digits 1 and 2 to simplify the interconnecting of the circuits. It will be clear that the multiplication tables for the numbers 4 to 9. inclusive, are followed in a similar manner throughout the length of the multiplying commutator.

Secured to the multiplying commutator shaft, but electrically insulated therefrom, is a control commutator I45 (Fig. 2) consisting of circular switches K, L and M for closing and opening various circuits at predetermined intervals throughout the multiplying cycle, the full purpose of which will be clearly understood as the description progresses.

A dial I46 (Fig. 4) attached to the commutator shaft I08 and rotatable therewith is divided or marked to indicate twenty-eight equal parts so that each division marking indicates a particular rotative position of the shaft I08 and its associated disk-units I04 rigidly mounted thereon relative to a fixed starting point. The positions one to twenty-eight are adopted to more clearly describe the sequence of events as the multiplying commutator I05 passes through one complete revolution, and it is to be noted at this point, as previously mentioned, that the units part of a product of two digits is registered during the first half revolution of the multiplying commutator; that is, positions one to fourteen, inclusive, and during the second half of the cycle, positions fifteen to twenty-eight, inclusive, the tens part is registered where the product consists of two digits (more than nine).

The distributor switch I06 (Fig. 1) is provided for transferring the electrical connections from units to tens, tens to hundreds, hundreds to ten hundreds, etc, as the multiplication progresses to complete an electrical circuit to the proper electromagnets in the accumulator or register I01. The distributor switch is similar in design to selector switches used in telephone systems and comprises in general a shaft I41, an electromagnet I48 (Fig. 2) for rotating it one step at a time, six brushes I49 to I54, inelusive, (Fig. 1) insulatively mounted upon the shaft, and arcuate banks I44 of twenty-two Stationary contacts adapted for cooperation with said brushes. Five of the brushes I49 to I53, inclusive, designate and are connected by conductors 'to the units (U), tens (T), hundreds (H), ten-hundreds (TH), and ten-thousands ('I'I) columns in the multiplicand key bank I00. The sixth brush I54 applies ground progressively to one of the columns indicating units (U), tens (T), hundreds (H), in the multiplier key bank IOI as the multiplication advancesto close the circuit therefrom through the multiplying commutator I05, multiplicand key bank I00, distributor switch I06, and the accumulator I01 to battery and ground.

The accumulator I01 can be remotely situated from the multiplicand and multiplier key banks to register the products of the multiplication and comprises in this embodiment of the invention eight rotatable brushes I60 to I61, inclusive, representing units (U) to ten millions (TM) columns in the final product, respectively, which brushes are adapted to make wiping engagement with an arcuate bank of contacts I68 having stati'onary terminals numbered 1--2-34--56 7-8- 9-0. The stopping of a brush on a particular terminal designates the number marked thereon so that it will be readily understood that the accumulator I01 registers digits proportional to the length of time the brushes I60-I61 are rotated.

The rotation of the accumulator brushes I60 to I61, inclusive, is accomplished by an electromagnetically operated means which will now be described; referring to Figs. 2, 4, 5 and 6 of the drawings, a shaft I1I suitably journaled on the frame IIO has a gear I12 secured thereto meshing with an idler gear I13 which in turn meshes with the gear II5 driving the shaft I08 of the multiplying commutator I05. The rotating shaft I1I has rigidly mounted thereon a plurality of spaced gears I14 adapted to drive gears I15 (Figs. 5 and 6) fastened to shafts I16 carrying loosely mounted sleeves I 11 to which the brushes I60-I61 are rigidly secured. Slidably keyed to and rotatable with the shaft I16 is a clutch member I18 having a serrated face I19 for engaging a companion serrated face I80 of the sleeve I11 to cause rotation thereof. The slidable and rotating clutch member I18 is provided with a groove I84 into which extends the bifurcated end of an armature I85 of an electromagnet I86 of any suitable type. A compression spring I81 is associated with the armature I85 to separate the driving clutch member I18 from engagement with the brush carrying sleeve I11 when the electromagnet I86 is deenergized. From the foregoing it will be obvious that the energizing of the electromagnet I86 will move the armature I85 thereof to compress the spring I81 and lock the serrated faces of the clutch member I18 and the sleeve I11 together to cause the rotation of its associated brush.

An index or register wheel I88 integral with on its periphery, which depressions are adapted to be engaged by a roller I89 mounted on a ,compression leaf spring I90 to center the brush with relation to the position of the stationary terminals in the arcuate bank I 68. Each depression has a number engraved therein starting with 1 and running consecutively as 2, 3, 4, 5, 6, 7, 8, 9 and 0 so that there are provided two com plete sets of indicating numbers on each register wheel. These numbers are so positioned on the periphery of the wheel that the depression immediately above the roller I89 indicates the number designated by its associated brush. For example in Fig.5 the brush I61 has stopped on the terminal 9 and the operator by looking at the depression 1 9| immediately above the roller reads the number 9 engraved therein. The use of the two complete sets of indicating numbers on each register wheel I88 gives a rapid indication in that a digit is registered for each half revolution of an index wheel.

In order to facilitate an understanding of the working relationship of the details of the computing system and to aiford a more eliec'tive means of describing many important functions thereof. such as the carry function of the accumulator and its method of simultaneously carrying tens to higher denominational orders, an explanation will be given of the steps performed in a specific example such as multiplying 72,293 by 159.

In order to accomplish this multiplication the driving motor II9 (Fig. 4) is connected to a suitable source of power (not shown) to cause continuous rotation of the multiplying commutator I05 and of the shaft I16 of the accumulator switch I 01 as has been previously described. Keys I02 (Figs. 3 and 10) in the multiplicand and multiplier key banks I00IOI (Fig. 1) of a key board I30 corresponding to the numbers 72,293 and 159, respectively, are then depressed, as indicated by the circles, to close electricalcircuits at those points. The operator then momentarily presses a start key I95 which closes a circuit from grounded battery I96, conductor I91, and

- the winding of a starting relay I98 to ground.

Relay I98 upon being energized establishes a looking circuit for itself from ground through its winding and right hand contact and armature,

each sleeve I11 has a series of twenty depressions conductor I99, and the winding of the electromagnet i48 of the distributor switch, to grounded battery. The current flowing through the distributor magnet I48 at this time is not suflicient to operate it, but it is suflicient to maintain relay I98 energized. The closure of the left hand contact of relay I98 connects brush 4 of the circular switch M of the control commutator I45 to ground, through conductor 20I, conductor 250, and the back contact of clear-out switch 202. When the control commutator I 45, which runs continually as a part of the multiplying commutator I05, reaches position 1, as indicated by the dial I46 (Fig. 4) a circuit is established through brushes M4 and M2, conductor 203, left hand winding of a pick-up relay 284, conductor 2I3 and the back contact and armature of the release relay '205 to grounded battery. Pick-up relay 204 is thereby energized and establishes a locking circuit for itself through its right hand inner contact.

Theoperation of the pick-up relay 204 also establishes a circuit from ground through brushes L4 and L2 of the control commutator I45, conductor 209, left hand inner contact of relay 204, conductor 2I0, conductor I99 to the winding of distributor switch magnet I48. The circuit Just traced is closed for twenty-five degrees of rotation from position 1 of the control commutator and performs two functions: It operates the distributor switch magnet I48 advancing the distributor brushes I49 to I54, inclusive, to stationary terminals I in the plurality of banks I44; and causes the short circuiting of the winding of starting relay I98 to thereby open its contacts and render the relay ineffective in the circuit. The pick-up relay 204 also establishes a circuit from brush L3, conductor 2I I, left hand outer contact of relay 204, conductor 208, conductor 2I2 to brush I54 of the distributor switch I06; the pick-up relay 204 also establishes another circuit from battery through the back contact of release relay 205, conductor 2I3, right hand outer contact of relay 204, conductor 2I4, the winding of a carry relay 2I5, conductor 245, brushes K3 and K4 to ground. The entire operation up to this point is a preliminary or preparatory function to start the multiplying operation at the proper place in the cycle.

The beginning of the actual multiplying operation occurs at rotative position 4 of the multiplying and control commutators when brush L3 makes contact and applies ground which will hereinafter be designated as the master ground. Ground is thereby established from brushes L4 and L3 through conductor 2II, left hand outer contact of pick-up relay 204, conductor 208, conductor 2I6, and the winding of a relay M1 to grounded battery. The operation of relay 2I1 closes contacts to complete individual circuits from the units (U) tens (T), hundreds (H), etc., columns in the multiplicand key bank I to their respective brushes I49I53 of the distributor switch I06. At the same time the master ground is supplied to the units column in the multiplier key bank IOI through brush I54, terminal 1 of its associated bank I44, and conductor 2I8. Contact 9 in the units column of the multiplier key bank I0I being closed due to the depression of that particular key, the master ground is continued through conductor I22 to a contact in each of the nine sets I03 of the multiplying commutator I05. This contact in each case as P viously described is so cut that it is closed in the first half of the cycle, positions 1 to '14, inelusive, at a point representing the digit in the units (U) column of the product of 9 times the number of the set.

The ground from the contact 9 of the units (U) column in the multiplier key bank I M is thus continued on through the various multiplying commutator junctions at the contacts representing the various digits of the products to the corresponding digit cross-lines of the multiplicand key bank I00. At this point the circuit from the master ground finds digit cross-lines connected through to the distributor switch I06 according to the specific problem set up on the multiplicand key bank I00. The first closure in the first half cycle is in the 2 set of the sets I03, that is, 9 times 2 which closes at rotative position '7. An illustration of the specific construction of the unit I04 having disks representing the products of multiplying 2 by 1, 9, and 2 can be had by referring to Fig. 8 of the drawings wherein the disk I26 has a radial contact I35 representing the units digit 8 of the product 18 of 9 times 2, which contact at rotative position '7 of the multiplying commutator makes a wiping engagement with a brush I36 connected to the conductor I22 (Figs. 1 and 9). As previously explained, the disk I26 is electrically connected through copper rivets I29 to a feed disk I40. This teed disk contacts continually with a feed brush I39 which is connected to a conductor 224, establishing a circuit to the digit 2 cross-line in the multiplicand key bank. In accordance with the multiplicand 72,- 293 in the problem assumed, the hundred (H) and ten-hundred (TH) columns in the multiplicand key bank I00 are connected to the digit 2 crossline, connecting the master ground at this time to conductors 225-226, the hundreds (H) brush I5I and the ten hundred (TH) I52 of the distributor I06, which brushes being on terminals 1 of the banks I44 continues the ground through conductors 22I228, conductors 229-230 to the hundreds (H) and ten-hundreds (TH) electromagnets I86 of the accumulator I01, through conductor 23I to battery. These hundred (H) and ten-hundred (TH) electromagnets I86 operate, engaging their clutches I18 (Fig. 6) and starting rotation of the hundred (H) and ten hundred (TH) brushes I62 and I63 (Fig. 2). At the same time hundred (H) and ten hundred (TH) holding relays 236 (Fig. 1) are operated over the same path and in parallel with the accumulator magnets I86. The holding relays lock through their own contacts to conductor 2I6, conductor 208, left outer contact of the pick-up relay 204, conductor 2I l to the brushes L3 and L4 in the control commutator, thereby holding the master ground to the hundred (H) and ten hundred (TH) accumulator magnets when the contact I35 of the disk I26 opens its circuit an instant later by rotating out of engagement with the brush I36.

One position later in the cycle, position 8, a brush I42 (Fig. 9) connected to the conductor I22 finds a contact closure, representing the units digit '1 of the product 27 of 9 times 3, through one of the disk units I04 in set 3 of the multiplication sets I03, through conductor 239, contact closure between the digit 3 cross-line and the units (U) column in the multiplicand key bank, conductor 240, left outer contact of relay 2l1 to the units brush I49 of the distributor switch I06. Since the brush I49 is resting on terminal 1 of the associated bank I44, the circuit is continued through conductor 24I, units (U) electromagnet I86 of the accumulator, conductor 23I to battery.

The energization of this units magnet I86 operates its associated clutch I18 and consequently causes the rotation of brush I60. At the same time the units (U) holding relay 236 looks through its own contact to keep the units (U) electromagnet I86 operated after the 9 times 3 contact in the multiplying commutator has been opened. At position 12 the junction of 9 times '7 finds itself connected through to the ten thousands (TT) magnet and operates and locks it. At position 14 the 9 times 9 junction operates and locks the tens (T) magnet in the same manner. One unit of rotation after this, which is position 15, the contact of the L3 brush is opened to break the master ground which has maintained all of the accumulator magnets I86 and relays 236 operated allowing the clutches I18 to release. The T1, TH, H, T and U accumulator brushes I64, I63, I62, I6I and I60 have been carried ahead 3, 8, 8, 1, and 7 spaces representing the units digit of the products of 9 times '1, 2, 2, 9 and 3, respectively.

When the commutators I05 and I45 have rotateed to position 15 the K3 brush of the control commutator I45 closes a circuit from ground, through brushes K4 and K3, conductor 245, the

winding of the carry relay 2I5, conductor 2I4, right outer contact of relay 204, conductor 2I3, back contact of the release relay 205 to battery and thus energize and operate the carry relay 2I5. The operation of the carry relay 2I5 is for the purpose of searching for a tens carry to be described. Since only the units digits of the result of multiplying the multiplicand by the units digit in the multiplier has been registered in the accumulator I01, no brush thereof has passed over 9 and no tens carry results at this time. Also, at position 15 the L2 brush closes for 25 operating the magnet I48 and advancing the distributor brushes I49 to I54, inclusive, to terminals 2 in the banks I44. The system is now ready to proceed with the registering of the tens digit of the aforementioned multiplication.

At rotative position 18, the L3 brush again closes to the master ground and the distributor brush I54 directs the ground to the units (U) column of the multiplier key bank I because terminals 1 and 2 of the associated bank I44 are connected together. The previous operation of the clutches I is repeated except that the second half of the cycle, positions to 28, inclusive, represents the tens digit of each product, that is, 8 of 9 times 9, 6 of 9 times 7, 2 of 9 times 3, 1 of 9 times 2 and 1 of 9 times 2. Distributor brushes I40 to I53 have been advanced to terminals 2 so as to connect the units (U) column of the multiplicand key bank I00 and its associated units (U) holding relay 236 to the tens (T) accumulator magnet I 86, through conductor 240, distributor brush I49, terminal 2, conductors 246 and 241, the winding of the tens (T) accumulator magnet to battery; in a similar manner, the

TM M HT TT TH H T U Denominations 7 2 2 9 3 Multiplicand 9 Multiplier 3 8 8 1 7 Units digits 6 l 1 8 2 Tens digits The action of the IT, TH and H accumulator brushes I64, I63, and I62, respectively, in the first cycle of the assumed problem affords an illustration of the method of carrying tens to higher denominational orders and will be described in detail. As already explained, the TI, TH, H, T and U accumulator brushes receive 3, 8, 8, 1 and '7, respectively, in the first half of the cycle; and in the second half of the cycle, the HT, TT TH, H and T brushes receive 6, 1, 1, 8 and 2, respectively. Now it will be noted that the H brush I62 has received 8 and 8 totaling 16, but has stopped on terminal 6 in the arcuate bank I68. However, in passing from terminals 9 to 0, the brush I62 made contact with an added terminal 248 in the bank I68. This terminal 248 is connected to a relay C2 which is operated over the following circuit; from battery at the C2 relay, through its winding, conductor 249,

through the added terminal 240, through the associated brush I62, conductor 250, the back contact of the clear-out switch 202 to ground. Upon operation, the C2 relay looks from battery through its winding, through its right contact, conductor 25I, and to ground through brushes KI and K4 cf the control commutator I45 when rotating between positions 20 and 4. In the meantime, the ten-hundreds (TH) accumulator brush I63 has received digits 8 and 1, stopping upon terminal 9 of the associated arcuate terminal bank I68 and the ten-thousands (TT) accumulator brush I64 has received the digits 3 and 1, stopping upon terminal 4. As rotative position 1 arrives, the L3 brush opens the circuit from the master ground, causing the actuated accumulator brushes to stop rotating and releasing the relay 2Il (Fig. 1) thereby disconnecting the accumulator magnets I86 from the multiplicand key bank I00 and the associated holding relays 236. At rotative position 1, the K3 brush operates the carry relay 2I5 over the path previously described, and at position 2, the K2 brush supplies ground to each of the left hand armatures of the CI to C6 relays, through a circuitfrom brush K2 of the control commutator I45, conductor 252, to the left hand contact of the relays CI to C6. Since only the hundreds (H) accumulator brush I62 has passed from 9 to 0, the C2 relay alone is operated and the ground from the K2 brush passes from the left armature of the C2 relay, conductor 253, right outer contact of relay 2I5, conductor 254, to' the winding of the ten-hundreds (TH) accumulator magnet I 86 which is operated. At rotative position 4 the K2 brush opens the above circuit, releasing the ten-hundreds (TH) clutch IIB after the ten-hundreds ,(TH) brush I63 has been rotated or advanced nation is illustrated by the ten-hundreds (TH) accumulator brush I63. It is to be noted at this point that the ten-hundreds (TH) brush I63 has received 8 and 1, totaling 9, at the same time that the hundreds (H) brush I62 received 8 and 8, totaling 16, so that it will be seen that the tenhundreds (TI-I) brush I63 came to rest on terminal 9 before the carry operation of the tens digit 1 from the total 16 on the hundreds (H) brush.

Referring to Fig. 2, contact disks 260 to 261, inclusive, are shown on the schematic directly under each of the accumulator brushes I60 to I61, inclusive, respectively. These disks are of a construction similar to the aforementioned sequence switches and are secured to the sleeves,

I11 and rotate with their respective accumulator brushes as illustrated in Fig. 6. Each of the disks comprises an insulator with superimposed pieces of conducting material providing contacts at proper times between three brushes, Z, F and 9, respectively, except the disks 260, 26I and .261 which have only the brushes Z and F. The feed brush F is always in contact and the brush designated as 9 is connected when, and only when, the associated accumulator brush is standing on the 9 terminal in the companion bank I68. This arrangement establishes a circuit whereby the carry current which was connected to the tenhundreds (TH) accumulator magnet I86 is conducted also to the ten-thousands ('I'I') accumulator magnet and the two accumulator magnets operate simultaneously by virtue of the fact that the ten-hundreds (TH) accumulator brush I63 was standing on the 9 terminal when the carry current arrived. Starting at the point where .the ten-hundreds (TI-I) accumulator magnet is energized to carry the tens digit 1 of the product 16 from the hundreds (H) accumulator brush I62, the simultaneous carry circuit is traced as follows: The winding of the tenhundreds (TH) accumulator magnet, conductor 254, brushes F and 9 of the disk 263, conductor 269, right hand middle contact of carry relay 2I5, conductor 210, the winding of the tenthousands (TT) accumulator magnet, conductor 23I, to battery to thereby operate the tenthousands ('I'l) accumulator magnet at the same time that the ten-hundreds (TH) accumulator magnet is operated. If a succession of the accumulator brushes were standing on terminals 9 and a carry current was supplied to the accumulator magnet of the one of lowest order, all of the accumulator brushes of the higher ones would advance and indicate zero simultaneously. This carry function is effective only during that part of the cycle reserved for the tens carry, namely rotative positions 1 to 3, inclusive, and positions 15 to 17, inclusive. This is true because the carry function is controlled by the carry relay 2I5 which is operated only during that part of the cycle named.

During the period that the carry function was being performed, the L2 brush in rotating from positions 1 to 3 had closed a circuit previously described to energize the electromagnet I48 and advanced the distributor brushes I49 to I54, inclusive, from terminals 2 to terminals 3 in their respective banks I44. At position 4 the L3 brush makes contact with the master ground through conductor 2I I, left hand outer contact of relay 204, conductor 208, conductor 2I2, distributor brush I54, associated terminal 3, conductor 215, to the tens column of the multiplier bank IOI. Since the digit 5 cross-line is connected with the tens column. the ground is extended through conductor 216, the winding of a multiplier relay 211 representing the digit 5, to battery. The operation of the relay 211 closes all of its leads to the proper junction points on the multiplying commutator I05 to ground. As the multiplier commutator rotates and makes contact for the units part of the results of 5 x7, 2, 2, 9 and 3, respectively, ground from the armatures of the multiplier digit 5 relay 211 is connected to the denominational columns in the multiplicand key bank I00, through contact closures to the proper di it cross-lines, through the contacts of relay 2I1 to the corresponding brushes I49 to I53, inclusive, of the distributor switch I06. This switch is now on terminal 3 and the HT, TT, TH and T accumulator magnets I88 and associated holding relays 236 are operated at the proper times to accumulate 5, 0, 0, 5. and 5 on the brushes I65, I64, I63, I82 and IGI, respectively, of the accumulator I01.

At position 15 the accumulator magnets k86 are released. the carry relay 2I5 operates and any required tens carry is made as previously described. At the same time the distributor switch I06 is advanced to terminal 4 by the L2 brush of the control commutator I45 closing a circuit from battery to ground and operating the electromagnet I48. During the next half cycle, positions 15 to 28, the tens part of each of the products of 5X7, 2, 2, 9 and 3 are registered as described above except that the distributor switch, being on terminal 4, now routes them to accumulator magnets M, HT, TT, TH and H (Fig. 2). At the end of this registry the tens carry function is again performed, the distributor switch is advanced to terminal 5 and the multiplicand 72,293 is multiplied by the hundreds digit 1 of the multiplier in a manner analogous to that described for multiplier digits 9 and 5. The distributor switch is then advanced to terminal 6 and the final tens carry is performed.

Upon the completion of this cycle, the product of 72,293 and 159 is standing in the accumulator I01 and the distributor switch I06 is advanced to terminal 7 by the L2 brush of the control commutator, closing the winding of the electromagnet I48 from battery to ground. As

the L3 brush makes contact at position 4, the

master ground is routed by distributor brush I 54 through terminal 7 in its associated bank I44, conductor 280, the winding of the release relay 205 to battery and ground. The operation of the release relay opens its back contact and thereby removes battery from the pick-up relay 204, releasing it and restoring all parts of the system to normal, except the accumulator brushes which retain the product.

It is to be noted that no multiplier relay 211 is operated when multiplying by digits 1 or 9, but there is one provided for each of the multiplier digits 2, 3, 4, 5, 6, 7, and 8. These relays are used to prevent errors which in some instances might occur through the connecting circuit for one digit while multiplying by another if these relays or similar means were not provided; that is, the relays 211 are so arranged that two connected unused multiplier circuits cannot make electrical contact closures through the commutator simultaneously.

The terminals 1, 2, 3, 4, 5, 6, 7, 8, 9, and 0 of each bank I68 are connected to a perforating apparatus, designated generally by the numeral 284, by a plurality of conductors 285 to correspondingly numbered terminals in arcuate banks 286 (Fig. 3) of individual selecting switches 281, commonly used in telephonic communicating systems. The digit cross lines of each of the denominational columns in the multiplicand and multiplier key banks I00 and IN, respectively, are also connected by a plurality of conductors 288 to individual selecting switches 289, having correspondingly numbered terminals in their arcuate banks 285, one of which is shown in Fig. 3 wherein the units (U) column of keys in the multiplier key bank IN is connected to the units (U) selecting switch 289. In order to avoid an un necessary duplication and complication of circuits, only one of each of the selecting switches 281 and 289, respectively, is illustrated in the circuit schematically, but it will be understood that similar selecting switches in the perforating apparatus 284 (Figs. 3 and 11) are provided for each of the denominational columns in the multiplicand and multiplier key banks I00-IOI and the accumulator I01.

Each brush or switch arm 290 of the plurality of selecting switches 281 and 289 is secured to a rotatable shaft 29I which is keyed to a pinion 292 meshing with a rack 293. This rack meshes with a spur gear 294 secured to a driven shaft 295 which is operatively associated with a segmental gear 296 driven by mechanism shown in Fig. 14, hereinafter to be described. The segadapted to engage and drive at predetermined intervals a plurality of selecting bars 291 representing denominational columns in the multiplicand and multiplier key banks and the accumulator, respectively, and having an enlarged end portion 298 of sufiicient size for engaging one at a time of a plurality of perforating pins 299 arranged in denominational rows or columns, each perforating pin in a column representing one of the numbers 0, l, 2, 3, 4, 5, 6, '7, 8, and 9, respectively. The engagement of each'selecting bar 291 with the driving segmental gear 296 is controlled by an individual bell crank lever 300 pivoted on a rod SM and held in a normal position by a spring 302. An arm of the bell crank lever 300 engages an armature 303 of a selecting electromagnet 304 so that when the selecting electromagnet is energized the armature will swing the bell crank lever clockwise and elevate the particular selecting bar into engagement with the rotating segmental gear 296. The selecting bars 291 which are selected at different points in the rotation of the segmental gear through the operation of the selecting electromagnets 304 are advanced to positions with their enlarged end portions 298 in vertical alignment with the desired, perforating pins. Following this selection of the perforating pins, a suitable mechanism is operated to cause the downward movement of a ram 356 common to the perforating pins for positively moving the enlarged end portions 298 and their selected perforating pins to thereby perforate apertures in a record card representing the numbers to be recorded. The ram is then moved upwardly and the segmental gear is rotated counter-clockwise to return the selecting bars to their normal retracted position.

Referring again to the specific problem presented and explained of multiplying 72,293 by 159 wherein the multiplication was completed and the product TM M HT T'T TH'HTU 1 1, 4 9 4, 587

indicated by the accumulator brushes I60 to I61, inclusive, a brief description will now be given of how that product is perforated in a record sheet or card. Upon rotation of the shaft 295, the segmental gear 296 and the spur gear 294 are retated; the rotation of the spur gear advances the rack 293 and rotates the shaft 29I through the pinion 292 secured thereto to thus effect the clockwise rotation of the brushes 290 of the selecting switches 281 and 289. As each brush makes contact with a terminal in the bank 286 which is electrically connected to a correspondingly numbered terminal in a denominational bank I68 of the accumulator and that numbered terminal is designated by the particular associated brush of the accumulator as a digit to be recorded, a circuit is completed to energize the particular selecting electromagnet 304 and operate its associated bell crank lever 300 to bring the selecting bar 291 representing the particular denominational column into engagement with the rotating segmental gear 296 and thus advance the selecting bar 291 a distance commensurate with the time of its initial actuation. The time of actuation of the selecting bar is so synchronized with the movement of the selecting brush to cause the enlarged end portion on the selecting bar to stop at the end of the clockwise rotation of the segmental gear on'the perforating pin representing the digit designated by the corresponding, denominational brush in the accumulator.

The'time of actuation of the selecting bars 291 in a clockwise rotative cycle of the segmental gear is dependent on the numerical value of the digit to be recorded; that is, the selecting bar to cause the recording of a digit 9 is actuated at the beginning of the rotative cycle, a selecting bar to record a digit '1 is actuated two periods of time later, a digit 4 five periods of time later, and a zero nine periods of time later. Thus it will be obvious that in recording the product 11,494,581 the selecting bar 291 representing the ten thousands (TT) columns thereof will be actuated at the start of the rotative cycle of the segmental gear 296 to have the enlarged end portion on the ten thousands (TT) selecting bars 291 stop up- ,on the perforating pin representing the digit 9.

As the selecting brushes rotate clockwise (Fig. 3) and contact with the terminals 9 the ten thousands ('II) brush effects the energization and operation of the ten thousand (TT) selecting electromagnet 304 through the following circuit: From grounded battery 3I0, through the winding of the (TT) electromagnet 304, the brush 290 of the ten thousands (TT) selectingswitch 281, terminal 9 in the ten thousands (TT) arcuate bank 286. one of the conductors 285, terminal 9 in the ten thousands (TT) bank I68, brush I64 of the accumulator I01, conductor 250, through the back contact of clear-out switch 202 to round. The operation of the ten thousands (TT) selecting electro-magnet 304 elevates the corres onding selecting bar 291 into engagement withthe segmental gear and the selecting bar is ad anc d as previously explained.

One period of time later as the selecting brush 790 contacts with the terminals 8 of the banks 286. t e brush of the tens (T) finder-switch 281 completes a similar c rcuit from rounded battery through the tens (T) relav 304, through the brush of the tens (T) finder switch 281, terminal 8 in the tens (T) bank 286, one of the conductors 285. +erminal 8 of the tens (T) hank I68. brush ISI of the accumulator I01. conductor 250 t rou h the hack contact of cl ar-out switch 9 2 to g und. The o eration of the tens (T) electr ma net 3'14 causes the t ns (T) column selecting ar 2 1 of the product to be actuated a va c d to s' l "t a rforating pin repres ntin the d git 8. In like manner the units I hundreds (H). ten hund ds (TH), hundred t sands (HT). millions (M), and ten milli s (TM) s l cting bars of the product are actuet d by the se mental gear in timed succession in the ord r named to select perforat ng. pins representing the digits '7, 5, 4-4, and 1-1, resp ct vely.

Likew se durin the same rotative cycle of the se mental ear 296. perforating pins in denomin iona columns representing digits in the multipl cai and multiplier can be selected simultaneously with the selection of the perforating p ns for the product thereof. As previously desc ibed the mult plicand 72.293 and multiplier 159 were set up in the multiplicand and multiplierkey banks 00 and IOI, respectively. by depressing keys I02 corresponding to the digits in the proper, denominational columns as disclosed in Pg. 1. For purposes of simplification, only the units (U) column of keys in the multiplier key bank MI is shown connected to a selecting switch 289. The other denominational columns of keys representing digits are similarly connected to individual selecting mechanisms and it will suffice to explain how the units (U) digit 9 of the multiplier HTU 159 is perforated in the record card.

Referring now to Fig. 3, the digit key 9 in the units (U) column is shown depressed to connect its lower contact 3!! to ground through conductor 3!2. The circuit is continued from the contact 3!! through one of the conductors 288, terminal 9 in the units (U) selecting switch 289, through its associated brush 290, conductor 3!4, through the winding of a unit (U) electromagnet 304 to grounded battery. The energization of the units (U) electromagnet 304 of the multiplier causes the elevating of its selecting bar into engagement with the segmental gear '296 in the same manner and at the same time as previously described for the digit 9 in the ten thousands (TT) column of the product 11,494,587. In an analogous manner the perforating pins representing the other digits in the multiplier and multiplicand are selected at different points in the clockwise rotation of the segmental gear. At this point the segmental gear 296 stops rotating and the enlarged end portions 298 of the proper denominational selecting bars are resting on the perforating pins representing the digits in the multiplier 159, the multiplicand 72,293 and the product 11,494,587. The ram 356 is then operated by suitable means and that perforating pin which is under the enlarged portion 298 on the selecting bar 29! in each denominational column of the multiplier. the multiplicand and the product thereof is driven through a record sheet to perforate the desired information as illustrated by the perforated card I36 in Fig. 19.

As the ram 356 operates, switching contacts 305 and 306 included in contact operating member 458 (Fig. 12) are operated. The operation of switching contact 305 opens the power circuits to the electromagnets 304 during the retraction of the selecting bars 291. Immediately thereafter the operation of switching contact 306 causes the energization and operation of an electromagnet 301 to effect the restoration of the depressed keys in the keyboard I30 to normal.

Also, during the same period of time the clear- 7.

,out switch 202 included in contact operating member 460 (Fig. 12) is thrown to the right, thereby opening the circuit to ground from the accumulator brushes and closing another circuit from ground through conductor 28!, the windings of relays 282 and 283 to battery. The operation of these relays connects ground on the Z brushes oi the disks 260 to 261, inclusive, associated with the accumulator brushes I60 to I61, inclusive, respectively. The windings of the accumulator magnets 86 are connected from the Z to the F brushes of the disks to battery whereby the accumulator magnets are operated to cause rotation of the accumulator brushes and the disks. As each accumulator brush arrives at normal position, zero (0), the Z brush finds a break in the disk which opens the circuit, releasing the accumulator magnet and stopping the accumulator brush on zero. Upon the retraction of the ram 356 and the actuated perforating pins to normal position, the contact operating member 460 (Fig. 12) rotates and clearout switch 202 is then moved to the left and the computing and recording system is put in condition to receive and record another problem of multiplication.

For a more minute description of the card punch mechanism and its mode of operation, reference is had to the following detailed description.

Referring now to Figs. 11 to 18, inclusive, the plurality of selecting electromagnets 304 are arranged in an arcuate staggered relation to permit the location of a large number of such electromagnets in a relatively small area. Each of these magnets is provided with suitable armatures 303 shown more clearly in Figs. 12 and 13 as being operatively associated with pivoted, bell crank levers 300. According to the preferred embodiment of the invention, the electromagnets 304 are mounted on rectangular shaped members which are secured to side plates 320 and 32! on the arc of a circle and are arranged in a manner such as to permit the ready, easy and quick removal of an electromagnet without disturbing any of the other electromagnets. The axis of the are on which the rectangular shaped members supporting the electromagnets are mounted corresponds approximately with the pivotal point of the bell crank levers 300. These bell crank levers are pivoted on the rod 30! and are moved from their normal position against the action of the spring 302 individual to each bell crank lever as previously described. When the electromagnet is deenergized the spring 302 is effective for quickly returning the associated bell crank lever to normal. In order to accommodate the springs individual to the levers 300 within a given area, two mounting plates 323 and 324 are displaced from each other and are secured to side plates 320 and 32!, thereby permitting the springs to be arranged in two rows, as shown in Fig. 13. Individual to each of the levers 300 is the selecting bar 29'! which is engaged on its under side by a pin 325 secured to'the free end of the bell crank lever 300. The selecting bars have on one surface a plurality of serrations or teeth 326, while on another surface a projection 32! is formed. The end of the bar 29'! opposite to that carrying the serrations or teeth 326 is the enlarged end portion 296.

The electromagnets 304 upon being energized elevate the bar 291 through the movement of the bell crank lever 30!! to a point where the teeth 326 thereof are brought into engagement with the segmental gear 296. This segmental gear 296 is mounted transversely of the selecting bars 29! (Fig. 12) and is secured to a shaft 309 which is journaled in the plates 320 and 32!. The shaft 309 (Figs. l2, l3 and 14) carries a gear 330 which is adapted to be oscillated by means of a rack 33! held firmly in engagement with the gear by a flanged roller 332. The rack 33! is secured to an operating bar 333 which has its opposite end secured to one end of a lever 334 which is pivoted at 335. The lever 334 is of the shape shown in Fig. 14 and has a roller 336 which cooperates with a cam groove 33! for causing the movement of the operating bar 333 and its associated rack 33! in accordance with the rotation of a cam 338. As is clear from the arrangement of the lever 334 and the cam 338 with which the roller 336 cooperates, the rack 33! will be reciprocated and will consequently impart to the segmental gear 296 through the gear 330 an oscillatory movement. Consequently, when the segmental gear 296 is oscillated in a clockwise direction the selecting bars 29! which have been actuated in accordance with the energization of the electromagnets 994 will be moved to the left, as viewed in Fig. 13. Conversely, when the segmental gear 299 is operated in a counter-clocktain the selecting bars in engagement with the segmental gear 299 upon their operation by the electromagnets 394 and to disengage the selecting bars from the segmental gear upon their retraction to the position shown in Fig. 13. In further explanation of 'this operation it will be noted that the under side of the selecting bar 291 has a depressed portion 949 in which the projecting portion of the bar 339 normally rests. When a selecting bar 291 is elevated through the operation of the pivoted lever 989 and is moved to the left through the oscillation of the segmental gear 299, it will be maintained in operative association with the segmental gear independently of the energization of the associated electromagnet 394, as thesurface'34i of the selecting bar 291 now rests on the bar 339. When the selecting bar 291 is retracted due to the oscillation of the segmental gear 299 in a counter-clockwise direction, and when it reaches a position where the groove 940 is in vertical alignment with the bar 999, the lipof thesbar 939 will engage the projection921 and cause the disengagement of the selecting bar 291 from the segmental gear 299J The cam 938 through which the rack 99! is reciprocated is mounted on a shaft 942 which extends transversely of the machine and which-is mounted to depending members 343 and 344 below the shaft 999. Also rigidly secured to the shaft 342 is a cam 945 which is provided with a cam groove 349 which is engaged by a roller 341. This roller 341 is carried by thefree end of an arm 949, which is integral with and mounted substantially central to a shaft 349 (Fig. 12),

which carries at its extreme ends arms 352 and 999 having connected thereto vertically extending links 954 and 3,55. Connected to the opposite ends of the links 994 and 395 is a member or ram 999 which extends transversely of and above the enlarged portion 288 of each of the selecting bars 291 and which is reciprocated on vertical guides 991, 959, 959 and 999. As shown in Fig. 18, the

member or ram 999 has a recessed portion 39! in which there is positioned a slotted member 392. This member is secured against movement, but "the recess 99l is of a depth sufllcient to permit predetermined vertical movement of the memr or ram 999.

The ends of the selecting bars 291 having the enlarged portion 299 slide in the slots or grooves formed in the member 392 and are thereby guided when moved to the left or right (Fig. 13) depending upon the direction of rotation of the segmental gear 299. Positioned belowthe member 992 and secured to and movable with the ram 999 is a plate 993 having aperturesa'rranged to receive the perforating pins 299. The perforating pins 299 are'arranged in a plurality of denominational columns or rows with ten pins to each row. Each of these perforating pinsis provided with a shoulder 994 which normally rests on the; upper surface of the plate 393. When a selecting W2" is moved to the left-(Fig. 13)

a distance depending upon the time at which it was caused to engage the teeth of the segmental gear 299, a perforating pin in the particular row or denominational column of perforating. pins to which the selecting bar 291 is common will be selected for operation. That is, for each movement of the selecting bar only one of the perforating pins 299 of the row of pins to which that particular selecting bar 291 is common will be selected for subsequent actuation, since the enlarged portion 298 thereof is of such dimension as to cover only one perforating pin 299. The actuation of the selected perforating pin 299 is effected through the downward movement of the ram 359 by the cam surface 949 which causes the perforating pins 299 to be positively depressed into operative association with aligned apertures 395 formed in a. die plate 399 which is rigidly mounted to a base plate 911. Interposed between the die plate 399 and the apertured member 999 are two similarly apertured plates 918 and 919 which are secured to opposite faces of blocks 399 and 38l which are supported by the base plate 311. Inasmuch as the apertures'in the plates 393, 318 and 318 are in vertical alignment with the apertures in the die plate 399, the perforating pins 299 will be accurately guided. The plate 919 is spaced from the die plate 999 a distance sufficient to allow the passage of a record sheet or card therebetween. When the cam surface 949 reaches a predetermined position in its rotation,

arm 348 will be moved downwardly for causing the upward movement of the ram 359. Plate 393 being moved with the ram 959 and being engaged by the shoulders 394 on the perforatingpins 299, elevates the actuated perforating pins to the position shown in Fig. 18.

As is clearly shown in Figs. 11 and 13, the machine is provided with an inclined table 382. The

table 382 is arranged to receive'a record sheet or card which is desired'to be perforated in accordance with certain predetermined operations of the keys in the multiplicand and multiplier key banks IOU-NH in the keyboard I39.

Following the placement of the record sheet or,

card on the tabale 982 and synchronously with the operation of the segmental gear 299, mechahaving arms 99 9 and 99l.

nism is operated for automatically advancing the sheet or card to a position below the perforat-- ing pins 299. This mechanism comprises a pair of oppositely disposed feed fingers 383 and 394 which, upon being moved, engage the sheet or card and positively advance it along the table 382 to a position where it is engaged by positively driven rollers 385 and 389. While the roller 995 is positively driven it is also pivotally mounted at 381 (Fig. 14) and held inoperative association with the roller 389 by means of a coil spring 998.

The feed fingers 383 and 984 are operated momentarily by means of a leverage arrangement which is reciprocated in synchronism with the oscillation of the segmental gear 299 by a cam 389 which is secured to the cam 349, but on the opposite side to the cam groove 949. J

' Specifically the mechanism for moving the feed fingers 383 and 984' comprises a. pivoted lever To the arm 999 is secured a roller 392 which engages the.,cam surface of the cam 399 and which upon such enageme'nt causes the movement of a collar 989 which is mounted loosely on a rod 984. Movement of the rod 994 is effected through a collar 399 rigidly secured thereto and a spring 999 which is interposed between the collars 399 and 399.. Operatively associated with the arm 991 is an adjustable screw 39'! which limits the movement of arm 390 and insures the proper engagement of the roller 392 with the cam 388. Secured to the end of the rod 394 opposite to the end on which the collar 393 is loosely mounted is a bar 398 which extends transversely of the table 382 and to which there is rigidly secured a U-shaped member provided with arms 399 and Each of the arms 399 and tell carries a link dill which is normally under the tension of a spring M2 and which is secured to a transversely extending bar 403. The feed fingers 333 and 335 are secured to the bar and since the top of the table 332 is slotted at i- (Fig. 11), the fingers 383 and 38 are capable of being moved upon the movement of the rod 385; and its associated U-shaped member including the arms S99 and 3%.

When the feed fingers 3855 and are lnoved in the manner just described, and provided arecord sheet or card had been placed on he table 382, it will be advanced to a position where it is engaged by the rollers and 53, after which the feed fingers will be retracted to a position receive another card. These rollers 15) are driven from the shaft which carries the segmental gear 295 through a t a of gears consisting of ears 495, MS, 3S, ill 352, M3, did and M5. th rollers 3535 and 383 which gears il and die respectively, through the train of gears just rel synchronism with the oscillation o It will thusbe seen that secured to rection for moving the record sheet or alignment with the perforating pins 52 and in an o posite direction for causing the retraction of the record sheet or card upon the rotation ne segmental gear in a direction opposite or to which caused the forward movement of the selecting bars The advancement and retraction of the record sheet or card is also facilitated by means of the rollers and J llii which are positively driven through gears H0 and M2, respectively, and which are oper ti" ely associated with spring pressed rollers and Mil-tit, respectively. shown in Figs. 14 and 18, the rollers n *u are interposed between the plates tlil portion thereof projecting through t e and are pivotally mounted at did-E23 respectively, resilient means l2l2-t22 ing provided for holding the respective rollers m y in contact with the rollers ti3=ii8 and The forward movement of the card is rested by a stop member e23 located between the die plate 356 and the plate Like the rollers and 386, the rollers tilt-H5 and dil -dill will be rotated first in one direction to advance the card and then in a reverse direction to retract the card in accordance with the oscillation of the segmental gear 2%.

As shown in Fig. 11, the rollers and 38% are provided with cut-out portions :24 to permit the mounting of a spring 425 which is formed with projecting portions 428 which extend into the cut-out portions 424 of the rollers 385 and 386. A card being advanced by the feed fingers 383 and causes the depression of the spring 425 upon its engagement by the rollers 385 and 386.

b It will thus be apparent that the projections 425 of the spring 425 are directly in the path of the perforated card as it is being ejected and will cause the card to be diverted along a different path than it traversed upon its advancement to be perforated. When the card is deflected by the projections 426 of the spring 425, the edge thereof strikes a surface 421 of spring pressed members 428-428 which cooperates with a surface of member 429 to cause the card to assume a horizontal position on the bottom of a hopper m as shown in Fig. 13.

Eower for driving the shaft 342 is ccmrnunicated from an electric motor (not shown) through a belt 43!, and a continuously rotating pulley wheel 432 which is secured to a shaft 433 to which there is also secured aworm wheel 434 Fig. 12. The worm wheel 434 engages a worm gear 435 which is rigidly secured to a stud shaft if-35. Also secured to the shaft 438 is a serrated member 43? of a clutch mechanism designated generally by the numeral 438. Positioned opposite to and on the driven shaft 342, the shaft being referred to as the driving shaft, is a pivoted member 435. The pivoted member 435 is normally urged to the right, as shown in Fig.

in th free end of the pivoted member 339.

ll projecting portion 442 of a collar secured to the driven shaft 342 forms a base away from which the spring 440 urges the pivoted member 33. pivoted member 43.; has a wedge-shaped member 443 positioned the urged an upward direction (see Fig. 15) by a spring Hi. The pivoted member 1 i also has a finger 445 at the extreme end thereof opposite the pivot point. The shaft 342 is supported by supporting member 344 upon which is also mounted an electromagnet 448 having an armature 549 which is urged away from the electro magnet by a spring 45:). Formed on the end oi the armature 448 is a detent 455 which engages a member Elia? pivoted on the support ii-i i.

vi hen the electromagnet 44B is energized, the detent 455 will be moved downwardly Fig. or to the left as viewed in Fig. 15, thus releasing the pivoted member 452, which, together with the pivoted member 432 will be moved to the right (Fig. 17), by the action of spring Mil. Conseouently the wedge-shaped member 443 will be forced to engage the serrated portion of the con- 'nuously rotating member 431. Just prior to the completion of the cycle of rotation of the pivoted arm 439, the projecting finger H5 engages a cam surface 453 mounted on the memher 452 for causing the spring actuated detent can to engage the pivoted member 452 and restrain it against movement to the right, as viewed in Figs. 12 and 17. In the further movement of the finger 445 a cam surface 454 is engaged thereby resulting in the movement of the pivoted member 439 to the left (Fig. 17) and the disengagement of the wedge-shaped member 843 from the serrated portion of the member 437. The elements just described will remain in this position until the subsequent energlzation of the electromagnet 448.

In addition to the cams 338 and 345, a. gear 455 is also mounted on the driven shaft 342. This gear meshes with a gear 455 which in turn meshes with a gear 451 secured to a stud shaft 458 (Figs. 12 and 16). The stud shaft 454 is mounted parallel to the shaft 342 and has mounted thereon at spaced points contact operating members 459 and 450. These contact operating members preferably consist of insulating and contacting portions which in the course of their rotation are operatively associated with contacts or brushes 461-46! and 462-452,

respectively, which are mounted on opposite sides of the respective contact operating members 459 and 460.- As will be described more in detail hereinafter, the contact operating members 459 and 460 contro1 the completion of circuits extending from the contact brushes 46I and 462 and specifically function to insure that the electromagnets 304 will be energized only during the forward stroke of the selecting bars 291' and that the actuating keys of the key board I30 and the operated elements of the computing or multiplying mechanism will be restored to normal.

The completion of circuits established through the actuation of the keys in the key board I30 and the elements of the computing or multiplying mechanism is effected to the electromagnets 304 of the perforating mechanism 284 through a switching mechanism indicated generally by the numeral 463. The switching mechanism 463 consists of the plurality of arcuate banks of contacts 286 and the brush 290 individual to each bank of contacts 288. Rotation of the brushes 290 which is in synchronism with the oscillation of the segmental gear 296 is effected through the gear 292 which is secured to shaft 29I upon which the brushes 290 are mounted. The rack bar 293 having teeth at each end cooperates with gears 292 and 294 and is held in this position by flanged rollers 464 and 465. The gear 294 is mounted on the shaft 295 which also carries a gear 468 (Fig. 14). Meshing with the gear 468 are the teeth of a rack bar 469 which is held in operative association therewith by a flanged roller 410. The upper end of the bar 469 has teeth formed at right angles to the surface at which the teeth engage the gear 468 are formed, which teeth engage a gear "I which is secured to the shaft 309. Intermeshing of the teeth formed on the upper part of the bar 469 is also effected by means of a flanged roller 412. From this description of the switching mechanism 463 it will be seen that circuits which are connected with the contacts 413 will be progressively completed upon the rotation of the brush 290-individual to the bank of contacts including the particular contacts connected with the actuated keys of the key board I30 or the elements of the computing or multiplying mechanism which are at that particular time operated.

In further explanation of the switching mechanism referred to generally by the numeral 463,

the small rectangles in the upper right hand cor- In further explanation of the key board I30 it is to be noted that on opposite sides thereof there are positioned two elongated members I and I56 which function to control various starting operations of the apparatus. For example, the member I55 through suitable contacts associated therewith, when depressed, causes the closure of the start key I95 in circuits extending to mechanism for setting into operation the computing or multiplying mechanism. Likewise, the member I56 serves to contro1 suitable contacts and consequently the closure of electrical circuits extending to apparatus forinitiating the operation of the elements constituting the perforating mechanism indicated generally b the numeral 284. Each of the denominationa columns or rows of keys representing the multiplicand I00 and. multiplier IOI in the key board I30 is provided with amember common to a plurality of the keys for maintaining the keys in an actuated condition once they are depressed as disclosed in the Hargan patent previously mentioned. For the purpose of restoring the actuated keys to normal an electromagnet 301 operatively connected to the member common to the keys has its operating winding connected to a suitable control circuit, which, when closed, causes its energization and thereby the'restoration of the depressed keys to normal. A repeat key 308 in-each row of the keys when depressed prevents the restoration of the keys associated therewith. It will also be noted that there is no zero key provided in the rows of keys on the key board. However, if it. is desired to perforate an aperture in the card in the position allocated to zero, no key'need be depressed and the perforation of zero will be automatically accomplished through the contacts of the key structure shown diagrammatically in Fig. 3. Inasmuch as the details of the key construction do not constitute a part of the present invention, a detailed description of the construction and operation of this part of the mechanism is believed to be unnecessary.

What is claimed is:

1. In an electrical computing system, means operable for setting up digits, a source of electrical energy, a computing means including elements representing computations of a plurality of digits, and means for completing circuits ""through all the operated setting up means and I computing means and the source of electrical enher of Fig. 11 designated by the numerals 416,

411, 418, 419, 480 and 43I are intended to indicate the location of switching mechanism similar to that designated by the numeral 463. However, for the sake of clarifying the drawings the details of the switch mechanism in this particular figure have been omitted. Contained in each of the rectangles 416 to 48I, inclusive, are a plurality of arcuate banks of contacts with a rotatable brush individual to each bank of contacts. As previously mentioned, the perforating mechanism includes a plurality of electromagnets 304.

These electromagnets are connected to the brushes of the respective switching mechanisms and are energized momentarily upon the passage of the brush individual thereto over a contact in the arcuate bank 01 contacts which is at that particular instant connected with battery either dlrectly through the contacts of a depressed key 1n the multiplicand and multiplier key banks I00--IOI of the key board I30 or the operating elements of the multiplying mechanism and the. contact controlling switch 459.

ergy to transmit impulses representing the result of a computation. i

2. In an electrical computing system, means I operable for setting up digits, a source of electrical energy, a plurality of movable elements,

each representing a computation of two digits,'

circuits connecting all of the setting up means with the elements, and means for actuating the elements to complete certain circuits as controlled by the operated setting up means to transmit electrical impulses representing the result of a computation.

3. In an electrical computing system, a source of electrical energy, means for setting up a multipllcand, means for setting up a multiplier, a continuously rotating multiplying device, circuits for connecting tne multiplicand and multiplier setting up means through the multiplying device to the source of electrical energy, and means 101 distributing into proper denominational circuits the electrical currents representing the products or the multiplication received from tne-c1rcuits through the multiplying device.

4. In an electrical multiplying system, means inatlonal order, and means controlled jointly by for setting up a multiplicanrl and a multiplier, a said devices and said'second set of contacts for multiplying commutator, electrical circuits assocontrolling entering of products on the accumucletecl therewith, a source of electricelenergy, later.

for rotettc the commutator continu- 5 11. A multiplying machine comprising in comously to close certain of the circuits through the hinction multiplier factor setting ,sievices, multie'licl multiplier setting up means to plilcand factor settlrl deci es, electrical devices the source of electrical energy to effect a multicontrolled by oi setting devices for pllcoticn. fc znlng products, a al anism for operelectz'cel commuting system, meals 1c eting said electrical lcvic l "in s tticg 1.132 a multi mu igclier, c. ctor entering ou ccmout g e1 s, :otetizr electrical cumulator, and z: e

and for comp ting cochmfirm "on toe electrical mu tiplication and multiplier setup 1 representiously during e driv- Zerent groups c group further uts, coal.

commutator means controll-c 3 t sizes-m .lulete 11-.

tiplyi; ntrolling means the com"- tlle rlstics 501' cc cause the ccolling In electri com-out 1g FStfilll, mess up :c factors, multi device for 21 sis representative products of multiplication c plus:

by one digit and M113: the estabment of electrical l ipulses in accordance lo the cligits set up in factor setting up means, means controlled by the electrical 1m set it ol means ssociete with sold control swine operative, means "ng scicl contacts to meme 5 l he e: c 1- l, w a

mi 01 mews d 2 m oses thus pic-local for eccm letting the prom Ewan" (W J +0 f n 7% cl; of computation, and electrical relays cor- 5257512 33526:cggruh gge m tlfllliii oy one of the ice r setting up means for a, ntelmnmcting means lcventing tne esteoushment or circuits which pm! an, My would cause accumulation of an incorrect v in. u 1L .lspdCand nroduct is determined by the eloq l6. In a machine of the character described, device of the character clescrib a we cDm-bmafimn cf Set a: multiplier keys of multiplier err-singed in cle11omranged m gmups simeimndmg to decimal 15. icl groups, plurality of multiplicend keys set of mw'tiphcan'i keys arranged in a r-" eft in denominational groups, a plurality of 3 correspondingfio the 01mm? 9f the constructed and connected to represent keys, a plurality of contacts an d n means controlled by the multiplier and "i0 decimal groups, plurality of groups of ontacts EZUEADHCSHQ keys for directing circuits through mrrespondmg to Various Products, -motions the contacts to represent a plurality of partial between said Contacts and groups of coma-CB8, products, on eccumnlatone plurality of devices second plurality 0f Sets Of n act! grouped. to having e uniform movement each time they correspond with a. plurality of decimal rd move, a. second set of contacts for each denom- 75 and electrical wnnections between the cona t 

